关于jqgrid的单元格默认值问题

[nierblack]

<table id="grid-table"></table>
<div id="grid-pager"></div>


<script type="text/javascript">
	jQuery(function($) {
		var grid_selector = "#grid-table";
		var pager_selector = "#grid-pager";
		var operation='<div class="visible-md visible-lg hidden-sm hidden-xs action-buttons"><a class="blue" href="#"><i class="icon-zoom-in bigger-130"></i></a><a class="green" href="#"><i class="icon-pencil bigger-130"></i></a><a class="red" href="#"><i class="icon-trash bigger-130"></i></a></div>';
		var grid_data = 
		[ 
			{operation:operation}
		]

	
		jQuery(grid_selector).jqGrid({
			//url:'tpl/f4Data.php',
			datatype: "json",
			height: 250,
			colNames:['XX', 'XX', 'XX','操作'],
			colModel:[
				{name:'id',index:'id', width:20, sorttype:"int", editable: true},
				{name:'station',index:'station', width:70, editable: true},
				{name:'remark',index:'remark', width:70, editable: true, editoptions:{size:"20",maxlength:"20"}},
				{name:'operation',index:'operation', width:20, fixed:false, sortable:false, resize:false}
			], 
			loadonce:true,
			viewrecords : true,
			rowNum:10,
			rowList:[10,20,30],
			pager : pager_selector,
			altRows: true,
			multiselect: true,
	        multiboxonly: true,
	
			//loadComplete : function() {}
			editurl: 'editTest.php',
			caption: "XX管理",
			autowidth: true
		});

	});
</script>

源代码如上图，因为操作单元格的每一行都是一样三个按钮，不可能每一次都后台返回三个按钮的HTML 吧，想在前端设置成默认值，但各种搜索未果，只有向各位大大求助。。。。

[Go 旅城通票]

{name:'operation',index:'operation', width:20, fixed:false, sortable:false, resize:false,formatter:function(){return operation}}